Procs

proc startsWith(s, prefix: cstring): bool {...}{.noSideEffect, gcsafe,
    extern: "csuStartsWith", raises: [], tags: [].}

Returns true if s starts with prefix.

If prefix == "" true is returned.

JS backend uses native String.prototype.startsWith.

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proc endsWith(s, suffix: cstring): bool {...}{.noSideEffect, gcsafe,
    extern: "csuEndsWith", raises: [], tags: [].}

Returns true if s ends with suffix.

If suffix == "" true is returned.

JS backend uses native String.prototype.endsWith.

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proc cmpIgnoreStyle(a, b: cstring): int {...}{.noSideEffect, gcsafe,
    extern: "csuCmpIgnoreStyle", raises: [], tags: [].}

Semantically the same as cmp(normalize($a), normalize($b)). It is just optimized to not allocate temporary strings. This should NOT be used to compare Nim identifier names. use macros.eqIdent for that. Returns:

0 if a == b
< 0 if a < b
> 0 if a > b

Not supported for JS backend, use strutils.cmpIgnoreStyle instead.

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proc cmpIgnoreCase(a, b: cstring): int {...}{.noSideEffect, gcsafe,
    extern: "csuCmpIgnoreCase", raises: [], tags: [].}

Compares two strings in a case insensitive manner. Returns:

0 if a == b
< 0 if a < b
> 0 if a > b

Not supported for JS backend, use strutils.cmpIgnoreCase instead.

  Source Edit